Road scraper



E. A. WEEKS May 1o, 1932.

ROAD SCRAPER Filed NOV. 28, 1928 4 Sheets-Sheet l INVENTOR ATTORNEY? May 10, 1932. E. A. WEEKS 1,858,214

ROAD SCRAPER Filed Nov. 28, 1928 4 Sheets-Sheet 42.

IN VEN TOR Ernest f7 Wee/fs ATTQRNEYj May b1932- E. A. WEEKS' 1,858.214

ROAD SCRAPER Filed Nov. 28, 1928 4 Sheets-Sheet 5 INvEg/gole mw! ff. J BY ATTORNE May 10, 1.932. i

.l-z.n A. WEEKS 1,858,214

ROAD SCRAPER v Filed Nov. 28, 1928 4 Sheets-Sheet 4 l INVENTOR' fir/esi Uefa/ns ATTORNEY;

Patented May l0, 1932 UNITED STATES PATENT or-'FICE mi' A. WEEKS, 0F KALAMLAZOO, MICHIGAN, SSIGNOR TO ROOT SPRING SCRAPEE COMPANY, F KALAMAZOO, MICHIGAN ROAD SCRAPER Application filed November 28, 1928. Serial No. 322,552.

This invention relates to improvements in road scrapers,J and is a continuation in part of my co-pending application Ser. No. 245,982, filed Jan. 11, 1928. A

The objects of the invention are:

First, to provide hydraulic control for a road scraper.

Second, to provide such a hydraulicstruc# ture which is self-contained as an attachment for a truck.

Third, to provide such a structure which will utilize a hand pump hydraulic pressure means.

Fourth, to provide improved detailed construction for the attachment and support oi a hydraulic power cylinder.

Fifth, to provide improved spring actuating connections to cooperate with such hydraulic control.

Further objects and objects pertaining to details and economies of construction will definitely appear from the description to follow.

I accomplish the objects of my invention by the devices and means described in the following specication. The invention is clearly defined and pointed out in the claims.

A device embodying my invention is clearly illustrated in the accompanying drawings 3o forming a part of this specification, in

which:

Fig. 1 is a detail outline side perspective view of a portion of the chassis or body of a truck with my improved scraper means in position, portions of the truck being broken away and other portions being indicated by dotted lines, taken in line with the cab back.

Fig. 2 is a detailed diagrammatic plan view of the-'hydraulic connections and actuating means as they appear in Fig. 1.

Fig. 3 is an enlarged detailed perspective view of the hydraulic cylinder and its'counections to the supporting beam, parts being shown broken away.

Fig. 4 is an enlarged detailed vertical longitudinal sectional view taken on section line 4 4 of Figs. 2 and 3, through the center of the hydraulic power cylinderyportions being shown in full lines and the arran ement of one of the return springs being indicated.

Fig. 5 is a detailed sectional elevation taken on line 5 5 of Figs. 2 and 3 showing the relation of the spring supported scraper to the hydraulic cylinder, scraper supporting beam and other parts.

Fig. 6 is an enlarged detailed sectional view taken on line 6 6 of Fig. 2,' a part of one turn of the spring being shown to indicate the operative relation of the coiled return spring means on the scraper rockshaft. 6@

Fig. 7 is an enlarged detail sectional elevation, parts in full lines, on line 7 7 of Figs. 1 and 2 through the pump valves and cylinder. f

Fig. 8 is an enlarged detail end elevation 65 of the pump taken from the right hand end of the pump as seen in Figs. 1 and 2.

Fig. 9 is a fragmentary perspective view comparable to Fig. 1 showing a modification of the connection from the hand pump to the hydraulic cylinder.

Fig. 10 is an enlarged detail of the flexible pant of such modified connection.

The parts will be identified by their numerals of reference which are the same in all 75 the views.

l is `the truck chassis frame. 2 is thecab.. 3 is the scraper supporting beam carried by adjustable supports or brackets 4, 4 bolted at 4l, 41 to chassis frame 1, and having curved S0 segments 42 on which the scraper beam 3 is carried adjustably by the clamps 44, the construction being identical on both sides of th'e' chassis. l

The scraper might be supported without adjustment but the hydraulic control permits very ready adjustment and is of advantage in that relation. l

The scraper supporting beam 3 is provided with hanger brackets 31,31 distributed along its length in which is supported the scraper rockshaft 5. The scraper 6 is carried by a series of vC-shaped bladesprings 7, preferably reinforced as`indicated. Centrally of therockshaft 5 are arms 51 for connection 95 of thehydraulic means. 8 is the hydraulic lcylinder secured to the beam 3 preferably by a pair of U-shaped bolts 81. The head of the cylinder 82 'is of heavy castin and notched to accommodate one of the anges ofv springs of the scraper supporting beam 3. The hydraulic cylinder is provided with the usual hydraulic piston 83 with a plunger rod 84 and with a return spring 85.

A cross head 86 is secured to the plunger rod 8'? and is provided with projecting pivots 8 Connecting links 52 connect the cross head to theactuating arms 51 of the rockshaft 5. Cross arm 9 with upturned ends91 -provides connection for the return springs 92 which are connected atthe opposite end to brackets 93 on the scraper supporting beam 3. These springs may provide the entire power for returning the piston and elevating the scraper or the spring 85 may perform this function.

Also, to facilitate this action, coiled springs 10 may be interposed between an abutment collar on bracket 31 and an adjustable collar 101 on the shaft 5, the same being adjustably secured in place by set screws 102, see Fig. 6. These springs may alone do the work.

There is considerable weight to the scraper structure and it seems best to provide a series in the manner indicated to insure even an steadycontrol, while it is equally clear that any one of the sets of springs referred to, if made suiiiciently strong, would do the work. v

I provide a pressure gauge 21 which may be connected to the hydraulic cylinder or any other part subjected to the pressure, and enables the operator to regulate the control of the force that he will apply to the scraper and this can be regulated to any degree within the capacity ory load of the truck or frame to which the hydraulic scraper structure is attached.

22 is a hand hydraulic pump, an inch plunger being suiiiciently large,with a lever pump handle 221. `11 is the delivery pipe connecv tion from the pump to the hydraulic cylinder. l

An oil reservoir 23 delivers through -pipe 231 to the pump. I provide a by-pass 232 lwith a globe valve 233 to permit the return ofoil from the hydraulic power cylinder to the reservoir 23 through pipes 11 and 231.

When the valve is closed, of course, the oil can be pumped intoithe cylinder, when the valve is open it relieves the pressure in the Yhydraulic cylinder and\ permits the return of oil to the reservoir when the springs act to raise the scraper.

' I have thus described my invention in its adaptations to a hand operated pump. The hydraulic control as here shown is of great importance.v The oil, when enclosed in the cylinder, is practicall, incompressible and holds the scraper ixe ly in place. By this means worm gears, pinions, and lock levers in common use are avoided and the waste of the great friction from the use of such de- 'vices is eliminated. The actionof this hydraulic means is 4easy because of the use of oil which, of course, is a lubricant and its action in the cylinder is easy and quick with a minimum of friction. In thel manipulation of a structure of this kind this advantage is of great importance.

I have described the structure as self-contained as an attachment to a truck. This is of very great advantage in such a structure but, of course, can be made use of in various ways.

I desire to claim the'invention specifically prising a supportin beam attachment to said chassis, hanger brac ets on said beam, a rockshaft journalled in said brackets, a spring scraper carried by said rockshaft, a hydraulic power cylinder piston structure mounted on said beam and connected to apply pressure to said scraper to hold it to the ground, spring return means for elevating said scraper, a hand operated hydraulic pump on said chassis with connectionsA to supply said hydraulic cylinder, a liquid supply reservoir connected to said pump and a b -pass with valve to permit the return of Huidl lic cylinder.

2. V1n a scraper structure, the combination of a truck chassis, a scraper structure comprising a supporting beam attachment t0 said chassis, hanger brackets on said beam, a rockshaft journalled in said brackets, a spring scraper carried by said rockshaft, a hydraulic power cylinder piston structure mounted on said beaml and connected to apply pressure to said scraper to hold it to the ground, means for elevating said scraper, a hand operated hydraulic pump on said chassis with connections to supply said hydraulic cylinder, a liquid supply reservoir connected to said pump and a by-pass with valve to permit the return of Huid from said hydraulic cylinder.

3. In a scraper structure', the combination 'of a truck chassis, a scraper structure comfrom said hydrauprising a supporting beam attachment to r said chassis, anger ackets on said beam, a rockshaft journalled in said brackets, a spring scraper carried by said rockshaft, a hydraulic power cylinder piston structure mounted on said beam and connected to apply pressure to said scraper to hold it to the ground, means for elevating said scraper, and a hand operated hydraulic pump on sai chassis with flexible connections to supply said hydraulic cylinder. Y

4. In a scraper structure, the combination of a truck chassis, a scraper structure comprising a supporting beam attachment t0 159 said chassis, a scraper adjustably supported beam, a piston in said. cylinder connected to on said beam, a hydraulic power cylinder actuate said scraper and hold it to its work, piston structure mounted on said beam and and a hand pump in the cab of said 4truck connected to apply pressure to said scraper for delivering fluid under pressure to said 5 to hold it to the ground, spring return means cylinder. 70

for elevating said scraper, a hand operated In witness whereof I have hereunto set my hydraulic pump on said chassis with conhand. v u nections to supply said hydraulic cylinder, a ERNEST A. WEKS. liquid supply reservoir connected to said 1G pump and a by-pass with valve to permit the 75 return of fluid from said hydraulic cylinder.

5. In a scraper structure, the combination a of a truck chassis, a scraper structure com- 5 prising a supporting beam attachment to said 30 chassis, a scraper adjnstably supported on said beam, a hydraulic power cylinder piston structure mounted on said beam and connected l,to apply pressure to said scraper to l hold it to the ground, means for elevating 85 said scraper, a hand operated hydraulic pump on said chassis with connections to supply said hydraulic cylinder, a liquid supply reservoir-connected to said pump and a by-pass with valve to permit the return of 90 fluid from said' hydraulic cylinder.

6. In a scraper structure, the combination of a truck chassis, a scraper structure comprising a supporting beam attachment to said chassis, a scraper adjustably supported on l 95 said beam, a hydraulic power cylinder piston structure mounted on said beam and con-l nected to apply pressure to said scraper to hold it to the ground, a sprin return means for elevating said scraper, an a hand oper- 100 ated hydraulic pump on said chassis with connections to supply said hydraulic cylinder.- A

7. In a scraper structure, the combination of a truck chassis, a scraper structure com- 105 prising a supporting beam attachment to said chassis, a scraper adjustably supported on said beam, a hydraulic power cylinder piston structure mounted on said beam and connected to apply pressure to said scraper l 110 to hold it to the ground, means for elevating said scraper, and a hand operated hydraulic pump on -said chassis with connections to supply said hydraulic cylinder.

8. In a structure of the class described a 115 der, and spring means to elevate said scraper.

truck having a body and a ab, a scraper structure comprising an adjustable supp'orting beam, a scraper pivotally supported thereon, a power cylinder mounted on said beam, a piston in said cylinder connected to actuate said scraper and hold it to its work, a hand pump in the cab of said truck for delivering fluid under pressure to said cylin- 9. In a structure of the class described, a truck having a body and a cab, a scraper structure comprising an adjustable supporting beam, a scraper pivotally supported. thereon, a power cylinder mounted on said 

